Yes, there are absolutely websites designed specifically to solve this problem. Because mainstream platforms like Zillow make you dig through text descriptions, several specialized real estate tech startups have emerged specifically to aggregate and map active listings with low-rate, assumable mortgages.

​The most notable platforms dedicated to this niche include:

​1. Roam

​Roam is one of the most prominent players in this space. Instead of just reading MLS remarks, they use public records and proprietary algorithms to scan active home listings and match them with the seller's underlying loan data.

  • ​What they show: They specifically target FHA and VA loans with interest rates well below current market averages (often in the 2% to 5% range).
  • ​The catch: They aren't available in every single state, but they cover large chunks of the US (including major markets in Texas, Florida, Arizona, Colorado, Georgia, Illinois, and more). They operate as a licensed transaction coordinator and charge a fee (typically around 1% of the purchase price) to handle the bureaucratic assumption paperwork, which is notoriously tedious.

​2. AssumeList

​AssumeList tracks tens of thousands of active and off-market properties with assumable loans.

  • ​What they show: Their platform filters specifically for VA, FHA, and USDA loans. A standout feature of AssumeList is that they calculate the "equity gap" (cash gap) directly on the listing preview. For example, it will tell you right away: Rate: 2.65% | Cash Gap: $17,000. This saves you from having to do the math to figure out how much cash you need to bring to the table to buy out the seller's equity.
  • ​The catch: It operates on a subscription model for serious buyers and real estate agents looking for premium data.

​3. Roots Homes

​Roots Homes allows users to "shop by payment" and targets buyers looking to capture ultra-low interest rates.

  • ​What they show: They list inventory specifically emphasizing the low monthly payment savings compared to financing a home at modern market rates. They primarily operate across states like California, Texas, Colorado, Arizona, Nevada, and Georgia.

​A Quick Word of Caution on These Sites

​While these databases are incredibly helpful for cutting through the noise, keep two things in mind:

  • ​The "Entitlement" Hurdle: Many of the best low-rate assumptions you see on these sites will be VA loans. While non-veterans can legally assume a VA loan, the seller will lose their VA loan entitlement until you pay off that mortgage in full. Because of this, many military sellers will explicitly state they will only allow another veteran with their own entitlement to assume the loan.
  • ​The Timeline: Standard home purchases close in 30 days. Loan assumptions frequently take 60 to 90 days (or more) because traditional lenders have very little financial incentive to prioritize processing a transfer on a 3% loan. Make sure your moving timeline is flexible!

​If you are looking at a specific city or region, it is often worth browsing one of these free tools first just to see how many low-rate loans actually exist in your target neighborhood.